Speed-changing apparatus.



A. SUNDH.

SPEED CHANGING APPARATUS. APPLICATION FILED 0cT.12. 1911.

Patented Apr. 6, 1915.

WTNESSES.' K

STATES PATENT OFFICE;

I SUNDH, F HASTINGS-UPON-HUDSON, NEW YORK, VASSIGNOR TO OTIS ELE- I if. VATOR COMPANY,

JERSEY.

0F JERSEY CITY, NEW JERSEY, A CORPORATION` OF NIRVA SPEEDLCHANGING APPARATUS.

. citizen of the United States, residing at Hastings-upon-Hudson, in the county of Westchester and State of New York, have invented a new and useful Improvement in 'Speed-Changing Apparatus, of which the following is a specification.

My invention relates to speed changing mechanism involving spur gearing, and

means in connection therewith to reduce the noise of the gearing when operating to a minimum.

The invention apprehends the use of a train of spur gearing placed within a driven element, such as an elevator sheave, a belt sheave, a friction clutch or other device. The gearing when placed within a sheave, clutch, or the like, requires practically no independent space whereby considerable economy in space which would otherwise be required for speed reduction mechanism 1s effected. In general with machinery where it is desired to have the speed either reduced or increased, pulleys or clutch mechanisms are ordinarily employed. With the present invention, the gearing for changing the speed can be put directly within such pulley or clutch mechanism andthereby re duce the amount of space required. This is of considerable practical importance in connection with elevators and other apparatus where the allotted space for the installation is often limited. n

The accompanying drawings illustrate a specific embodiment of the invention.

Figure 1 is a part sectional side elevation of the mechanism; F ig. 2 is a part sectional end elevation as indicated by the section line 2 2 on Fig. 1.

The mechanism as herein shown, comprises a bedplate 1 having a drive shaft 2 extending into a hollow stationary shaft 3. The latter is supported in standards 4 mounted on the bedplate 1. The hollow shaft 3 is held against rotation by means of keys 5. Ball bearings 6 are placed between the hollow shaft 3 and the drive shaft 2. A sheave or drum S is rotatably mounted "on the hollow shaft 3 and is driven by means of a train or trains of spur gearing located wlthin the sheave and connecting the latter .with the driveshaft 2. The hollow shaft 3 Specification of Letters Patent. l

Patented Apr. 6, 1915.

Application led October 12, 1911. Serial No. 654,228.v

inner ends of the hollowfshaft. Pivot-rods 12 extend between these flanges and on said rods are mounted spur gears 13 meshing are extended and provided with gear teeth to form pinions 14 which mesh with an annular gear 15. Ball bearings 16 are preferably interposed between the rods 12 and the gears mounted thereon. The sheave S is provided with internal lugs or plates 17 which extend between pairs of lugs 18 formed 0n the periphery of the annular gear 15.. Coil springs 19 are interposed between the lugs 17 and 18, and form a yielding connection between the sheave S and the annular gear. The hollow sheave S is preferably filled or partly filled with oil.

When the drive shaft 2 is rotated, the self-alining pinion 7 drives@ e three gear wheels 13 and the pinions14 integral with said gears to transmit motion with reduced speed to the annular gear 15. The latter through the yielding connections above 'described rotates the sheave S. The sheave S is formed with double walls so as to provide spaces 20, 21, 22, 23, which may be filled with any suitable noise deadening material, or may be left simply as dead air spaces. This forms a means for muiling or deadening the sound of the gearing. The outer wall or face 24 of the sheave S is removably secured in place by bolts 25. A ring 25 is also preferably made in sections so as a-lso to be removable after the bolts 25 have been removed. This arrangement permits of easy access to the gearing within the sheave. That is, a support may be placed under the sheave and the standard 4 and rear face plate 24 of the sheave removed without removing the driving cables from the sheave. The gearing within the sheave can then be examined or repaired as may benecessary. This arrangement by which the gearing is readily accessible is of great advantage in connection with elevators and the like, where, on account of the requirements of insurance companies or for other reasons frequent inspections of the. mechanism are necessary.

lt will be understood that my invention is applicable to various forms of apparatus vwith the pinion 7. The hubsof the gears 13 construction and 'arrangement of parts might also be employed without departing from the spirit and scope of my invention. i I wish therefore not to be limited to the 5 particular form of apparatus disclosed.I

What I claim as new and desire to secure by Letters Patent of the United States is:

1. The combination of a driving lslieave and spur gearing within the sheave and con- 10 nected to drive the same, said sheave being formed with hollow walls which serve tov deaden the noise generated by the spur gearing.

2. Thel combination of a driving sheave, 

